The Consensus Validation Conference on Augmentative and Alternative Communication Intervention brought together researchers, educators, parents, clinicians, and persons who use Augmentative and Alternative Communication (AAC) systems to arrive at consensus on best practices and benefits of AAC. Questions addressed include: definition of AAC and specification of who can benefit from its use; the nature, scope, and essential components of AAC intervention; relationships that should exist among people with significant communication disabilities and their families; professionals and funding sources to achieve effective outcomes; expected consumer and societal outcomes and benefits; relationship of AAC to receptive and expressive communication; and future research and education needs. (JDD)